I'll never put my real phone number or address on any contest... it's not worth the spamming. If they try to call somebody else who's random number I used them good for them, they deserve a free tablet for my meddling with their number.

So why enter in the first place then if you're using fake info? As for spamming, to be honest that doesn't really happen unless you let it (i.e. if you forget to uncheck the boxes giving them permission to e-mail you). In particular, it won't happen from contests sponsored by reputable organizations, and this is one of them. I am not denying that there are contest sites out there that have been specifically setup for the purposes of farming for e-mails, but you just have to learn how to distinguish which ones are which.

I'll never put my real phone number or address on any contest... it's not worth the spamming. If they try to call somebody else who's random number I used them good for them, they deserve a free tablet for my meddling with their number.

There are some contests with so many winners that they just mail out prizes to the address on the form without notifying the winner. You might be missing out on them.

I don't unless it only requires an email address. Anyway, code for me this morning "There was an error redeeming the gift card, please try again.". Dunno if they sent a bum code or if there is something wrong with play store, oh well.

This makes it seem like unused balance expires after some period of time. The prize email only mentions that you need to enter the code given before March 31 2014 but doesn't say anything about the balance itself expiring.

Edit found it in the contest fine print:

All Instant Win Prizes must be claimed on or before 12:00:00 PM ET on March 31st, 2014, and must be redeemed by January 31st, 2015.

So, don't sit on it FOREVER apparently it is not like a gift card. Still that's a long time to not use it hehe.